Tuesday, 29 March 2011 14:14

AMD preparing Barts based HD 6790

Written by Slobodan Simic
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AMD's answer to GTX 550 Ti

According to reports from Nordic Hardware and various rumours that are floating around, AMD is preparing yet another mid-range card that will be based on the well known 40nm Barts GPU, the Radeon HD 6790. According to this naming scheme, the new HD 6790 should end up faster than the Juniper based HD 5700 cards but it will be based on the same design as the Barts flavored HD 6800 series.

The upcoming Radeon HD 6790 should end up with 800 Stream Processors organized in 10 streaming multiprocessor units. This simply means that there will be two blocks of 400 SPs with a dispatch processor for each block.

Bear in mind that the Juniper series HD 5770 also have 800 SPs but they are arranged differently. The Barts LE, as some decided to name it, will feature 32 ROPs, 40 TMUs and a 256-bit memory interface although the amount of memory it will pack is still unknown. The first rumors put this card at 840MHz GPU and 1050MHz (4.2GHz effective) memory clocks, although nothing is carved in stone and clocks can be easily changed. The card should have a 150W TDP and will need two 6-pin PCI-E power connectors.

According to our info, the new Radeon HD 6790 card should have the same price as the Geforce GTX 550 Ti. Performance wise, the Radeon HD 6790 should end up a bit faster than the GTX 550 Ti, at least in some games. The card is scheduled for an official release on April 5th.

Nordichardware.com managed to score a picture of the chip design so you can check it out here.

Last modified on Tuesday, 29 March 2011 16:13
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Comments  

 
+18 #1 Nerdmaster 2011-03-29 16:55
A bit faster but cheaper at the same time. With more overclocking potential than 550. (6850 can reach 1GHz so 6790 will probably do so). 550 is alredy clocked pretty high so it cant be overclocked much.
 
 
+17 #2 Bl0bb3r 2011-03-29 17:11
The average power usage should be below 100W seeing how the 6870 draws 110W and 6850 only 90W, given that 6790 has 160 shaders less than 6850, just as many less as 6850 has compared to the full Barts. Even the peak power usage should not be above 110W, making if more economical than the 550.
 
 
-10 #3 123s 2011-03-29 17:29
WTF...150W TDP, gotta be a mistake or the card fails even more then 5830
 
 
+7 #4 Nerdmaster 2011-03-29 18:34
Quoting Bl0bb3r:
The average power usage should be below 100W seeing how the 6870 draws 110W and 6850 only 90W, given that 6790 has 160 shaders less than 6850, just as many as 6850 has compared to the full Barts. Even the peak power usage should not be above 110W, making if more economical than the 550.


No the peak power should be between 6870 and 6850 because it has higher voltage than 6850 making it less efficient. Still it will be more efficient than the crappy 550. Imo 6850 is a better card than 6790.
 
 
+8 #5 Nubstick 2011-03-29 19:32
According to the source, it has the same transistor count as Barts Pro and XT. This points to a salvaged part and explains the crappy power consumption and voltage, aka a 5830 redux. But at the right price and performance it could find a good spot in the market.
 
 
+3 #6 Bl0bb3r 2011-03-29 19:41
@Nerdmaster, Voltages are not specified anywhere so no point here.

Even with higher voltages, the power usage mostly increases with active shaders or in this case decreases with inactive shaders and this has been proven in the 6950 BIOS-flashed to 6970 case.

Also, the voltage differences are small in this series. The smallest voltages for 6850 are between 1.15v and 1.17v in 3D, while for the 6870 are between 1.17v and 1.2v in 3D. Not a very huge gap and in tests the peak power for the 1.2v 6870 is lower than that of the 1.17v card.

http://www.techpowerup.com/reviews/HIS/Radeon_HD_6870/27.html
http://www.techpowerup.com/reviews/Powercolor/HD_6870_PCS_Plus/25.html
 
 
+3 #7 Bl0bb3r 2011-03-29 19:43
@Nubstick, that crappy power is not a fact... it's only a guessed value based on the power connector count. Welcome to the land of rumors!
 
 
+3 #8 Nubstick 2011-03-29 19:57
Quoting Bl0bb3r:
@Nubstick, that crappy power is not a fact... it's only a guessed value based on the power connector count. Welcome to the land of rumors!





None of the stats are facts, it's all speculation. Just going with what there is.
 
 
+5 #9 Cartman 2011-03-29 20:14
I have a feeling that this in crossfire would be killer combo
 
 
+9 #10 nforce4max 2011-03-30 01:55
6850 or gtx 460. The gts 450 and the gtx 550ti are a complete joke just like the 5830.

Fodder cards :zzz
 

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